btree_date.c

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/*
 * contrib/btree_gist/btree_date.c
 */
#include "postgres.h"
 
#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/fmgrprotos.h"
#include "utils/date.h"
#include "utils/sortsupport.h"
 
typedef struct
{
    DateADT     lower;
    DateADT     upper;
} dateKEY;
 
/* GiST support functions */
PG_FUNCTION_INFO_V1(gbt_date_compress);
PG_FUNCTION_INFO_V1(gbt_date_fetch);
PG_FUNCTION_INFO_V1(gbt_date_union);
PG_FUNCTION_INFO_V1(gbt_date_picksplit);
PG_FUNCTION_INFO_V1(gbt_date_consistent);
PG_FUNCTION_INFO_V1(gbt_date_distance);
PG_FUNCTION_INFO_V1(gbt_date_penalty);
PG_FUNCTION_INFO_V1(gbt_date_same);
PG_FUNCTION_INFO_V1(gbt_date_sortsupport);
 
static bool
gbt_dategt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(date_gt,
                                            DateADTGetDatum(*((const DateADT *) a)),
                                            DateADTGetDatum(*((const DateADT *) b))));
}
 
static bool
gbt_datege(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(date_ge,
                                            DateADTGetDatum(*((const DateADT *) a)),
                                            DateADTGetDatum(*((const DateADT *) b))));
}
 
static bool
gbt_dateeq(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(date_eq,
                                            DateADTGetDatum(*((const DateADT *) a)),
                                            DateADTGetDatum(*((const DateADT *) b)))
        );
}
 
static bool
gbt_datele(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(date_le,
                                            DateADTGetDatum(*((const DateADT *) a)),
                                            DateADTGetDatum(*((const DateADT *) b))));
}
 
static bool
gbt_datelt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(date_lt,
                                            DateADTGetDatum(*((const DateADT *) a)),
                                            DateADTGetDatum(*((const DateADT *) b))));
}
 
 
 
static int
gbt_datekey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
{
    dateKEY    *ia = (dateKEY *) (((const Nsrt *) a)->t);
    dateKEY    *ib = (dateKEY *) (((const Nsrt *) b)->t);
    int         res;
 
    res = DatumGetInt32(DirectFunctionCall2(date_cmp,
                                            DateADTGetDatum(ia->lower),
                                            DateADTGetDatum(ib->lower)));
    if (res == 0)
        return DatumGetInt32(DirectFunctionCall2(date_cmp,
                                                 DateADTGetDatum(ia->upper),
                                                 DateADTGetDatum(ib->upper)));
 
    return res;
}
 
static float8
gdb_date_dist(const void *a, const void *b, FmgrInfo *flinfo)
{
    /* we assume the difference can't overflow */
    Datum       diff = DirectFunctionCall2(date_mi,
                                           DateADTGetDatum(*((const DateADT *) a)),
                                           DateADTGetDatum(*((const DateADT *) b)));
 
    return (float8) abs(DatumGetInt32(diff));
}
 
 
static const gbtree_ninfo tinfo =
{
    gbt_t_date,
    sizeof(DateADT),
    8,                          /* sizeof(gbtreekey8) */
    gbt_dategt,
    gbt_datege,
    gbt_dateeq,
    gbt_datele,
    gbt_datelt,
    gbt_datekey_cmp,
    gdb_date_dist
};
 
 
PG_FUNCTION_INFO_V1(date_dist);
Datum
date_dist(PG_FUNCTION_ARGS)
{
    /* we assume the difference can't overflow */
    Datum       diff = DirectFunctionCall2(date_mi,
                                           PG_GETARG_DATUM(0),
                                           PG_GETARG_DATUM(1));
 
    PG_RETURN_INT32(abs(DatumGetInt32(diff)));
}
 
 
/**************************************************
 * GiST support functions
 **************************************************/
 
Datum
gbt_date_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 
    PG_RETURN_POINTER(gbt_num_compress(entry, &tinfo));
}
 
Datum
gbt_date_fetch(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 
    PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
}
 
Datum
gbt_date_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    DateADT     query = PG_GETARG_DATEADT(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
 
    /* Oid      subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    dateKEY    *kkk = (dateKEY *) DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;
 
    /* All cases served by this function are exact */
    *recheck = false;
 
    key.lower = (GBT_NUMKEY *) &kkk->lower;
    key.upper = (GBT_NUMKEY *) &kkk->upper;
 
    PG_RETURN_BOOL(gbt_num_consistent(&key, &query, &strategy,
                                      GIST_LEAF(entry), &tinfo,
                                      fcinfo->flinfo));
}
 
Datum
gbt_date_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    DateADT     query = PG_GETARG_DATEADT(1);
 
    /* Oid      subtype = PG_GETARG_OID(3); */
    dateKEY    *kkk = (dateKEY *) DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;
 
    key.lower = (GBT_NUMKEY *) &kkk->lower;
    key.upper = (GBT_NUMKEY *) &kkk->upper;
 
    PG_RETURN_FLOAT8(gbt_num_distance(&key, &query, GIST_LEAF(entry),
                                      &tinfo, fcinfo->flinfo));
}
 
Datum
gbt_date_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc(sizeof(dateKEY));
 
    *(int *) PG_GETARG_POINTER(1) = sizeof(dateKEY);
    PG_RETURN_POINTER(gbt_num_union(out, entryvec, &tinfo, fcinfo->flinfo));
}
 
Datum
gbt_date_penalty(PG_FUNCTION_ARGS)
{
    dateKEY    *origentry = (dateKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    dateKEY    *newentry = (dateKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
    float      *result = (float *) PG_GETARG_POINTER(2);
    int32       diff,
                res;
 
    diff = DatumGetInt32(DirectFunctionCall2(date_mi,
                                             DateADTGetDatum(newentry->upper),
                                             DateADTGetDatum(origentry->upper)));
 
    res = Max(diff, 0);
 
    diff = DatumGetInt32(DirectFunctionCall2(date_mi,
                                             DateADTGetDatum(origentry->lower),
                                             DateADTGetDatum(newentry->lower)));
 
    res += Max(diff, 0);
 
    *result = 0.0;
 
    if (res > 0)
    {
        diff = DatumGetInt32(DirectFunctionCall2(date_mi,
                                                 DateADTGetDatum(origentry->upper),
                                                 DateADTGetDatum(origentry->lower)));
        *result += FLT_MIN;
        *result += (float) (res / ((double) (res + diff)));
        *result *= (FLT_MAX / (((GISTENTRY *) PG_GETARG_POINTER(0))->rel->rd_att->natts + 1));
    }
 
    PG_RETURN_POINTER(result);
}
 
Datum
gbt_date_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(gbt_num_picksplit((GistEntryVector *) PG_GETARG_POINTER(0),
                                        (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
                                        &tinfo, fcinfo->flinfo));
}
 
Datum
gbt_date_same(PG_FUNCTION_ARGS)
{
    dateKEY    *b1 = (dateKEY *) PG_GETARG_POINTER(0);
    dateKEY    *b2 = (dateKEY *) PG_GETARG_POINTER(1);
    bool       *result = (bool *) PG_GETARG_POINTER(2);
 
    *result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
    PG_RETURN_POINTER(result);
}
 
static int
gbt_date_ssup_cmp(Datum x, Datum y, SortSupport ssup)
{
    dateKEY    *akey = (dateKEY *) DatumGetPointer(x);
    dateKEY    *bkey = (dateKEY *) DatumGetPointer(y);
 
    /* for leaf items we expect lower == upper, so only compare lower */
    return DatumGetInt32(DirectFunctionCall2(date_cmp,
                                             DateADTGetDatum(akey->lower),
                                             DateADTGetDatum(bkey->lower)));
}
 
Datum
gbt_date_sortsupport(PG_FUNCTION_ARGS)
{
    SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
 
    ssup->comparator = gbt_date_ssup_cmp;
    ssup->ssup_extra = NULL;
 
    PG_RETURN_VOID();
}